[MPlayer-users] Cropping in original-size vs reduced-size

[Nico Sabbi]

Jorge Fábregas wrote:

>On Friday 23 March 2007 8:09 am, Nico Sabbi wrote:
>  
>
>>why don't you crop before rescaling?
>>    
>>
>
>I do. I was just talking hypothetically just to show my point.
>
>  
>
>>something like
>>crop=704:480:8:0,scale=608:-10,expand=640:480
>>    
>>
>
>Why would I crop black bands in order to have them back (using the expand 
>option)?
>
>  
>
don't expand then

>The problem I'm having is:
>
>1- If I crop based on original frame size and I my target resolution is 
>640:480, the actual footage will not be 4:3. Let me make this clear:
>
>It's not the same to crop and scale than to scale and crop.  I know the first 
>one is the way to go but I just don't know how to end up with the proper size 
>if I downscale to 640x480 for example.
>
>2- (hypothetically speaking). If I scale to 640:480 I'm actually getting 4:3 
>(and the image looks as it should AR-wise) but then I have black bands on 
>sides that I want to get rid of.
>
>Basically, I want to downscale but I'm not sure if for proper downscaling you 
>should consider the original frame size (720x480 with black bands on sides) 
>or if you need to just consider the actual contentent (cropped).  I tend to 
>think is the first one..since that's the way the signal is sent ot the TV 
>when I play the DVD on my TV.
>  
>

-vf crop=704:480:8:0,scale=640:-10 

scales to y' (closest x16) keeping A/R, even after having cropped


 
 
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